QT49S-50.000MAAJ-T

Overview

The QST QT49S-50.000MAAJ-T is a surface-mount quartz crystal oscillator operating at a fundamental frequency of 50 MHz. It utilizes the HC-49/US SMD package with dimensions of 11.4mm x 4.8mm x 3.8mm. The component features a frequency tolerance of ±30ppm at 25°C and a load capacitance of 18pF. It exhibits a maximum series resistance (ESR) of 80 Ohms and a static capacitance of 7pF. The device supports a standard operating temperature range and complies with RoHS lead-free standards, ensuring environmental safety for electronic assemblies.

Feature Summary

• Standard SMD HC-49/US footprint for direct PCB compatibility
• High-frequency stability with ±30ppm tolerance
• RoHS compliant lead-free construction

Applications

• General-purpose clock sources in consumer electronics
• Microcontroller system timing references
• Digital communication interface synchronization

Procurement Notes

Verify the specific suffix 'MAAJ' against the manufacturer's current datasheet to confirm the exact frequency tolerance and temperature range specifications. Ensure the ordering part number matches the required load capacitance and ESR parameters for the target circuit design. Cross-reference the package dimensions with the PCB footprint to guarantee mechanical fit during assembly.

Selection Notes

Select this component when a 50 MHz reference signal is required within a standard HC-49S form factor. The 18pF load capacitance must align with the oscillator circuit's external capacitor values to achieve the specified ±30ppm accuracy. Consider the 80 Ohm ESR limit to ensure reliable startup conditions within the host application's drive level constraints.

Part Context

This model belongs to the QT49S series of surface-mount quartz crystals manufactured by QST. The series provides various frequency options within the HC-49/US package, catering to diverse timing requirements. The MAAJ suffix typically denotes specific stability and packaging attributes defined by the manufacturer's coding system for this product line.

Replacement Considerations

Compatible substitutes include other manufacturers' HC-49S packages rated for 50MHz with ±30ppm tolerance and 18pF load capacitance. Verify that alternative parts match the 80 Ohm maximum ESR and physical dimensions to maintain electrical performance and mechanical integrity without redesigning the host circuit.